I claim the ornamental design of a stud, as shown and described.
FIG. 1 is a left/front perspective view of the stud showing my new design, shown broken in the center with a double line to indicate that no particular length is claimed.
FIG. 2 is an enlarged left side view thereof. The right side view is identical to the left side view.
FIG. 3 is an enlarged rear view thereof.
FIG. 4 is an enlarged front view thereof.
FIG. 5 is a top plan view thereof. The bottom view is identical to the top view.
FIG. 6 is a left/front perspective view of a second embodiment of the stud, shown broken in the center with a double line to indicate that no particular length is claimed.
FIG. 7 is an enlarged left side view thereof. The right side view is identical to the left side view.
FIG. 8 is an enlarged rear view thereof.
FIG. 9 is an enlarged front view thereof; and,
FIG. 10 is a top plan view thereof. The bottom view is identical to the top view.
The double line shown in FIG. 1 forms no part of the claimed design. In addition, the shading lines shown in all of the drawings represent the approximate three-dimensional contour of the design, and thus are not intended to indicate surface decoration.